Emission features in IRAS low-resolution spectra of MS, S and SC stars

Details Emission features in IRAS low-resolution spectra of MS, S and SC stars Emission features in IRAS low-resolution spectra of MS, S and SC stars

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...333..305l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 333, Oct. 1, 1988, p. 305-315.

Astronomy and Astrophysics

Astronomy

75

Carbon Stars, Cosmic Dust, Emission Spectra, Infrared Astronomy Satellite, S Stars, Variable Stars, Black Body Radiation, Interstellar Matter, M Stars, Silicates, Stellar Mass

Scientific paper

The authors find a progression of emission features due to dust grains in the 8 - 22 μm region of IRAS low-resolution spectra of MS, S, and SC stars that parallels their increasing C:O ratio and s-process enhancement. Strong S stars usually show a 9 - 14 μm emission feature which peaks around 10.8 μm, whereas mild S or MS stars show a variety of features ranging from the typical 10 μm silicate emission to a three-component feature, to the 10.8 μm S star feature. SC stars show either the S star feature or the SiC feature. The infrared excesses in the 8 - 22 μm region correlate very strongly with the period of Mira S, MS, and SC variables. The excesses also correlate with mass loss rate for these stars.

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